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dc.contributor.authorAbdelsayed, Victor
dc.contributor.authorEllison, Candice R.
dc.contributor.authorTrubetskaya, Anna
dc.contributor.authorSmith, Mark W.
dc.contributor.authorShekhawat, Dushyant
dc.identifier.citationAbdelsayed, Victor, Ellison, Candice R., Trubetskaya, Anna, Smith, Mark W., & Shekhawat, Dushyant. (2019). Effect of Microwave and Thermal Co-pyrolysis of Low-Rank Coal and Pine Wood on Product Distributions and Char Structure. Energy & Fuels, 33(8), 7069-7082. doi: 10.1021/acs.energyfuels.9b01105en_IE
dc.description.abstractDirect conversion of a low-rank coal into valuable chemicals or improving its char’s coking value became very demanding goals in coal utilization strategies. In this work, the co-pyrolysis of a low-rank lignite coal and pine wood sawdust biomass blended at a 3:1 coal-to-biomass ratio was investigated along with original coal and biomass samples by microwave-assisted and conventional thermal methods at 550 °C under nitrogen and ambient pressure. The carbon structure and its reactivity in generated chars and the product distributions were greatly affected by the applied heating mechanism and the presence of biomass during coal pyrolysis. High gas and low tar yields were observed for all microwave chars in comparison to thermal chars, regardless of composition. The addition of biomass to coal increased the tar yield under both methods and to a higher extent under the microwave. This agrees with the high gas yield and high aromatic-to-aliphatic fraction observed under the microwave and the presence of biomass. The high O/C ratio and low fixed carbon content in a biomass structure relative to coal affect the product distribution during microwave pyrolysis. This could selectively heat the biomass in the sample, remove its polar groups, and convert it into an efficient microwave absorber biochar that can decompose coal efficiently during co-pyrolysis. The aromatic carbon stacking and its ordering in the generated chars were investigated by powder X-ray diffraction, Raman spectroscopy, dielectric property measurements, and electron spin resonance techniques. A synergistic effect was observed upon biomass addition during microwave coal pyrolysis. Electron spin resonance spectroscopy revealed that the microwave coal/biomass char is the most stable char with the lowest free radical concentration. This agrees with the highest IG/Iall band area ratio calculated from Raman analysis revealing a more graphitic nature for carbon in this char. Similarly, the dielectric properties confirmed that the addition of biomass to coal under the microwave has the highest loss tangent, indicating a high graphitic nature compared to pure biochar or coal char.en_IE
dc.description.sponsorshipThis work was performed in support of the US Department of Energy’s Fossil Energy Gasification Systems Technology Research Program. The Research was executed through the NETL Research and Innovation Center’s Advanced Reaction Systems. Research performed by Leidos Research Support Team staff was conducted under the RSS contract 89243318CFE000003. We gratefully also acknowledge Frank Thomas, John Johnson and Zachary Kemerer for running the reactor.en_IE
dc.publisherAmerican Chemical Societyen_IE
dc.relation.ispartofEnergy & Fuelsen
dc.subjectLignite coalen_IE
dc.subjectchar characteristicsen_IE
dc.subjectradical concentrationen_IE
dc.subjectpine wooden_IE
dc.titleEffect of microwave and thermal co-pyrolysis of low-rank coal and pine wood on product distributions and char structureen_IE
dc.contributor.funderU.S. Department of Energyen_IE
dc.local.contactAnna Trubetskaya, -. - Email:

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